Lace tightening device



FIG. 1 is a perspective view of a lace tightening device showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is an opposite, inverted side view thereof; and,

FIG. 5 is a bottom view thereof. 

CLAIM The ornamental design for a lace tightening device, as shown and described. 